[137169] in North American Network Operators' Group
Re: Too bigs are sacred, was: Re: IPv6 addressing for core network
daemon@ATHENA.MIT.EDU (David Freedman)
Wed Feb 9 18:27:44 2011
Date: Wed, 09 Feb 2011 23:26:46 +0000
From: David Freedman <david.freedman@uk.clara.net>
To: Owen DeLong <owen@delong.com>
In-Reply-To: <85C23ECB-3C90-42CF-9ACF-FD23CE58FAD0@delong.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> Unless every packet you emit is =BE the minimum MTU (1280), then, you need
> to be able to receive TOOBIG messages.
Can you think of a packet type I will emit from my publically numbered
backbone interface which may solicit a TOOBIG that I'll have to care about?
I can only think of three cases, all ICMP:
1. An unreachable of some kind (I don't care if this is delivered or not,
and why would I be sending them from the backbone? Even rate-limited? If I
send them at all this is the responsibility of the edge)
2. A Time Exceed, again, don't care if this is delivered or not
3. A TOOBIG, if I'm getting a TOOBIG in response to my TOOBIG then we all
have bigger problems to worry about :)
Dave.
>=20
> Owen
>=20
--=20
David Freedman
Claranet=20
http://www.clara.net
